{"id":"CVE-2021-1789","kind":"vulnerability","aliases":["CVE-2021-1789"],"related":[],"title":"Apple Multiple Products: Apple Multiple Products Type Confusion Vulnerability","description":"A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. Processing maliciously crafted web content may lead to arbitrary code execution.","summary":"A type confusion bug in WebKit-based Apple products lets crafted web content trigger memory corruption. An attacker who gets a victim to load a malicious page can run arbitrary code on the device.","severity":"high","cvss":8.8,"epss":0.13975,"exploited":true,"exploited_at":"2022-05-04T00:00:00+00:00","products":[{"name":"Apple Multiple Products","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["apple","exploited","infrastructure","ios","macos","safari","webkit"],"not_affected_if":["fully-patched-devices"],"how_to_check":null,"fix":"Update Apple devices and software to the vendor-fixed release per Apple's advisory; the sources do not give the version.","status":"open","published_at":"2021-04-02T18:15:21+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:17:39+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:17:39Z","model":"claude-haiku-5-5","output":{"fix":"Update Apple devices and software to the vendor-fixed release per Apple's advisory; the sources do not give the version.","reach":"internet","impact":"high","summary":"A type confusion bug in WebKit-based Apple products lets crafted web content trigger memory corruption. An attacker who gets a victim to load a malicious page can run arbitrary code on the device.","category":"infrastructure","who_cares":["apple","ios","macos","safari","webkit"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs arbitrary code on the victim device via a web page","analyst_note":"Find Apple's security advisory for CVE-2021-1789 to get affected and fixed versions and confirm the exploited-in-the-wild status; check the CISA KEV entry for the due date.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["fully-patched-devices"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000457,"input_tokens":2823,"output_tokens":350,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-001':83C,88C '-1789':12A,15A '-2021':11A,14A '11.2':79C '14.0.3':100C '14.4':91C,95C,98C '2021':82C,87C '7.3':93C 'address':66C 'appl':1A,4A,19B,34B 'apple':16A 'arbitrari':56B,109C 'attack':44B 'base':33B 'big':77C 'bug':29B 'catalina':84C 'code':57B,110C 'confus':8A,28B,63C 'content':39B,105C 'corrupt':42B 'craft':37B,103C 'cve':10A,13A 'devic':60B 'execut':111C 'exploit':20B 'fix':74C 'get':46B 'handl':70C 'improv':68C 'infrastructur':21B 'io':22B,94C 'ipado':97C 'issu':64C,72C 'lead':107C 'let':36B 'load':50B 'maco':23B,76C 'malici':52B,102C 'may':106C 'memori':41B 'mojav':89C 'multipl':2A,5A 'multiple':17A 'page':53B 'process':101C 'product':3A,6A,35B 'products':18A 'run':55B 'safari':24B,99C 'secur':80C,85C 'state':69C 'sur':78C 'trigger':40B 'tvos':90C 'type':7A,27B,62C 'updat':81C,86C 'victim':48B 'vulner':9A 'watcho':92C 'web':38B,104C 'webkit':25B,32B 'webkit-bas':31B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-04-02T18:15:21+00:00","kev":{"dateAdded":"2022-05-04","dueDate":"2022-05-25","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-1789","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-1789","severity":null,"published_at":"2022-05-04T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T17:39:57+00:00","note":null},{"source":"epss","external_id":"CVE-2021-1789","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-1789","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:45+00:00","fetched_at":"2026-10-23T19:13:45+00:00","note":null},{"source":"nvd","external_id":"CVE-2021-1789","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-1789","severity":null,"published_at":"2021-04-02T18:15:21+00:00","modified_at":"2026-06-17T03:32:33+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}